CN217107252U - Differential pressure sensor and exhaust gas recirculation system - Google Patents
Differential pressure sensor and exhaust gas recirculation system Download PDFInfo
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- CN217107252U CN217107252U CN202220105709.8U CN202220105709U CN217107252U CN 217107252 U CN217107252 U CN 217107252U CN 202220105709 U CN202220105709 U CN 202220105709U CN 217107252 U CN217107252 U CN 217107252U
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Abstract
The utility model discloses a differential pressure sensor and exhaust recirculation system, differential pressure sensor includes: a housing having a receiving chamber and first and second air holes communicating with the outside; the first pressure module, the second pressure module and the signal processing chip are all arranged in the containing cavity, the first pressure module is used for acquiring a first pressure signal, and the second pressure module is used for acquiring a second pressure signal; the signal processing chip is electrically connected with the first pressure module and the second pressure module and used for receiving and processing the first pressure signal and the second pressure signal to obtain a differential pressure signal; the external connecting part is arranged on the shell and connected with the signal processing chip for leading out the differential pressure signal of the signal processing chip. According to the utility model discloses differential pressure sensor simple structure convenient assembling can be used for the pressure measurement to high temperature and have smoke and dust and corrosive gas's adverse circumstances.
Description
Technical Field
The utility model relates to a pressure detection technical field, concretely relates to differential pressure sensor and exhaust recirculation system.
Background
In the automotive industry, much effort has been made over the years to meet emissions requirements in order to improve engine combustion efficiency and reduce emissions, where EGR (exhaust gas recirculation) systems are considered as an effective way to reduce emissions and improve efficiency. In an EGR system, calculation of the EGR rate is critical to the normal use of the EGR system. And calculation of the EGR rate requires measurement of the exhaust flow at the EGR exhaust end. The differential pressure sensor can calculate exhaust mass flow by measuring the differential pressure across the exhaust-side venturi. Because the gas medium at the exhaust end is exhaust gas just discharged from an engine, the medium temperature is high, the content of smoke dust and corrosive gas is high, and the medium compatibility of the existing sensor is highly required. In the conventional differential pressure sensor, an MEMS chip is sealed in a sealed cavity with an incompressible fluid, and both ends of the MEMS chip sense pressure with flat membranes and calculate a pressure difference. The structure has complex process and is not easy to be produced in mass, and the independent pressure at the two ends of the Venturi tube can not be read out respectively.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a differential pressure sensor can acquire pressure signal respectively alone and handle and reachs pressure difference signal, and simple structure convenient assembling, can be used for the pressure measurement to high temperature and have smoke and dust and corrosive gas's adverse circumstances.
According to the utility model discloses differential pressure sensor, include: a housing having a receiving chamber and first and second air holes communicating with the outside; the first pressure module and the second pressure module are arranged in the containing cavity, the first pressure module faces the first air hole to obtain a first pressure signal, and the second pressure module faces the second air hole to obtain a second pressure signal; the signal processing chip is arranged in the accommodating cavity and is electrically connected with the first pressure module and the second pressure module respectively so as to receive and process the first pressure signal and the second pressure signal to obtain a differential pressure signal; and the external connecting part is arranged on the shell and connected with the signal processing chip so as to lead out the pressure difference signal of the signal processing chip.
According to some embodiments of the present invention, the housing includes a first case and a second case, a bottom of the first case is opened to define the accommodating chamber together with the second case, and the first air hole and the second air hole are formed on the second case.
According to some embodiments of the utility model, the second casing be equipped with the first through-hole of first gas pocket intercommunication and with the second through-hole of second gas pocket intercommunication, first pressure module is established first through-hole department and orientation first gas pocket, second pressure module is established second through-hole department and orientation the second gas pocket.
According to some embodiments of the invention, the differential pressure sensor further comprises a first sealing element and a second sealing element, the first sealing element being provided between the first pressure module and the second housing, the second sealing element being provided between the second pressure module and the second housing.
According to some embodiments of the present invention, the first sealing member and the second sealing member are both formed as a sealing ring, a first step portion is formed in the first through hole, a second step portion is formed in the second through hole, the first sealing member is compressed between the first pressure module and the first step portion, and the second sealing member is compressed between the second pressure module and the second step portion.
According to some embodiments of the invention, the signal processing chip is fixed at one side of the second housing facing the first housing.
According to some embodiments of the present invention, the signal processing chip includes a substrate and a flexible circuit board for transmitting a voltage signal, the flexible circuit board is respectively connected with the first pressure module and the second pressure module electrically.
According to some embodiments of the utility model, differential pressure sensor still includes the clamp plate, the base plate is established on the clamp plate, the clamp plate is located hold the intracavity and with shell fixed connection.
According to some embodiments of the utility model, be equipped with on the base plate with the first mounting hole that first pressure module corresponds and with the second pressure module links the second mounting hole that corresponds, flexible circuit board passes first mounting hole with first pressure module just passes the second mounting hole with second moulding-die group connects.
According to some embodiments of the invention, the externally connected component is formed as a socket, the contact pin of the socket being connected to the signal processing chip, the socket of the externally connected component facing the lateral part of the housing.
According to some embodiments of the invention, the housing is provided with a connection hole running through the first shell and the second shell, the fastener passing through the connection hole to fixedly connect the first shell and the second shell.
The utility model discloses still provide an exhaust recirculation system.
According to the utility model discloses exhaust gas recirculation system includes: in the differential pressure sensor and the venturi tube according to any of the embodiments described above, the first air hole and the second air hole of the differential pressure sensor are respectively communicated with both ends of the venturi tube.
Therefore, according to the differential pressure sensor of the embodiment of the invention, the first pressure module, the second pressure module and the signal processing chip are all arranged in the shell, the shell can protect the first pressure module, the second pressure module and the signal processing chip so as to isolate the first pressure module, the second pressure module and the signal processing chip from the external environment and the measured medium, thereby effectively isolating the influence of the environment with corrosive gas and smoke dust on the differential pressure sensor, enabling the differential pressure sensor to work in the severe environment with high temperature and high content of smoke dust and corrosive gas, preventing the unstable output caused by the environmental influence of the differential pressure sensor so as to improve the output stability of the signal, and by arranging two independent first pressure modules and second pressure modules, the first pressure signal and the second pressure signal can be respectively obtained, and the differential pressure signal is obtained by the number acquisition and calculation of the signal processing chip, simple structure just is suitable for the volume production, can acquire solitary pressure signal moreover respectively, and then can improve the accuracy of the differential pressure signal who acquires.
Drawings
Fig. 1 is a schematic structural diagram of a differential pressure sensor according to an embodiment of the present invention.
Reference numerals:
100: a differential pressure sensor;
1: housing, 11: first housing, 12: first air hole, 13: second housing, 14: second air hole, 15: connection hole, 16: an accommodating chamber;
21: first pressure module, 22: second pressure module, 23: first seal, 24: a second seal member;
31: substrate, 32: first flexible circuit board, 33: second flexible circuit board, 34: first mounting hole, 35: second mounting hole, 36: first step portion, 37: a second step portion;
4: pressing a plate;
5: external member, 51: pin, 52: and (4) inserting the socket.
Detailed Description
The differential pressure sensor 100 according to the present invention will be described in detail with reference to the accompanying drawings and the following detailed description.
A differential pressure sensor 100 according to an embodiment of the present invention is described below with reference to the drawings.
As shown in fig. 1, a differential pressure sensor 100 according to an embodiment of the present invention may include a housing 1, a first pressure module 21, a second pressure module 22, a signal processing chip, and an external component 5.
The housing 1 has a containing cavity 16 and a first air hole 12 and a second air hole 14 communicated with the outside, the first air hole 12 and the second air hole 14 can be respectively used for communicating with a measured medium, for example, the first air hole 12 and the second air hole 14 can be respectively connected with two ends of a Venturi tube so as to be respectively used for detecting the pressure at the two ends of the Venturi tube.
The first pressure module 21, the second pressure module 22 and the signal processing chip are all disposed in the accommodating cavity 16, the housing 1 can be used for encapsulating the first pressure module 21, the second pressure module 22 and the signal processing chip, the first pressure module 21 faces the first air hole 12 for obtaining a first pressure signal, the second pressure module 22 faces the second air hole 14 for obtaining a second pressure signal, specifically, the first pressure module 21 can be used for detecting the first pressure signal transmitted by the medium to be detected through the first air hole 12, the second pressure module 22 can be used for detecting the second pressure signal transmitted by the medium to be detected through the second air hole 14, wherein the first air hole 12 and the second air hole 14 can be used for detecting pressure signals in different environments or different positions, for example, the first pressure module 21 and the second pressure module 22 can be respectively used for detecting pressure signals at two ends of the venturi tube.
Optionally, the first pressure module 21 and the second pressure module 22 may be pressure sensing modules using a metal thin film as a dielectric isolation film, so that reliability can be improved, and the influence of corrosive gas and smoke on the pressure modules can be effectively isolated while the output of the pressure modules is ensured.
The signal processing chip is arranged in the accommodating cavity 16 and is electrically connected with the first pressure module 21 and the second pressure module 22 respectively so as to receive and process the first pressure signal and the second pressure signal to obtain a differential pressure signal, the first pressure signal detected by the first pressure module 21 and the second pressure signal detected by the second pressure module 22 can be transmitted to the signal processing chip, and the signal processing chip acquires the first pressure signal and the second pressure signal and performs processing calculation so as to obtain the differential pressure signal. The external connecting component 5 is disposed on the housing 1 and connected to the signal processing chip for deriving a differential pressure signal of the signal processing chip, and the external connecting component 5 may be connected to other external devices, for example, the external connecting component 5 may be connected to an external wiring harness for transmitting and deriving a differential pressure signal detected by the differential pressure sensor 100.
Therefore, according to the differential pressure sensor 100 of the embodiment of the present invention, the first pressure module 21, the second pressure module 22 and the signal processing chip are all disposed in the housing 1, the housing 1 can protect the first pressure module 21, the second pressure module 22 and the signal processing chip, so as to isolate the first pressure module 21, the second pressure module 22 and the signal processing chip from the external environment and the measured medium, thereby effectively isolating the influence of the environment with corrosive gas and smoke dust on the differential pressure sensor 100, so that the differential pressure sensor 100 can work in the severe environment with high temperature and high content of smoke dust and corrosive gas, and prevent the unstable output caused by the environmental influence of the differential pressure sensor 100, so as to improve the output stability of the signal, and by providing the two independent first pressure modules 21 and the second pressure module 22, the first pressure signal and the second pressure signal can be respectively obtained, the signal processing chip is used for acquiring the number of users and calculating to obtain the pressure difference signal, the structure is simple, the device is suitable for mass production, and the individual pressure signals can be obtained respectively, so that the accuracy of the obtained pressure difference signal can be improved.
In some embodiments of the present invention, as shown in fig. 1, the housing 1 may include a first housing 11 and a second housing 13, the bottom of the first housing 11 is opened to define a containing cavity 16 together with the second housing 13, the first air hole 12 and the second air hole 14 are formed on the second housing 13, such that the first housing 11 and the second housing 13 cooperate to define the containing cavity 16 together, the first pressure module 21, the second pressure module 22 and the signal processing chip are disposed in the containing cavity 16, when assembling, the first pressure module 21, the second pressure module 22 and the signal processing chip can be assembled after being installed at first, thereby facilitating the installation of the differential pressure sensor 100, and realizing mass production, and the process is simple.
In the example shown in fig. 1, the first housing 11 and the second housing 13 may be arranged one above the other, the first housing 11 may be formed in a hollow structure with the bottom open, the second housing 13 may be formed in a substantially plate-like structure, the first housing 11 is provided on the second housing 13 to define the accommodation chamber 16 together with the second housing 13, the first air hole 12 and the second air hole 14 are formed on the bottom surface of the second housing 13, and the exterior component 5 is provided on the first housing 11. Alternatively, the first housing 11 and the second housing 13 may be formed of a metal material or plastic.
In some examples of the present invention, the differential pressure sensor 100 may further include a fastener, the housing 1 is provided with a connection hole 15 penetrating the first and second cases 11 and 13, and the fastener passes through the connection hole 15 to fixedly connect the first and second cases 11 and 13, thereby facilitating the installation and assembly of the first and second cases 11 and 13. Alternatively, the fastening member may be a threaded fastening member such as a screw or a bolt, the connection hole 15 may be formed as a threaded hole, and the first and second cases 11 and 13 may be fixed by the threaded connection of the threaded fastening member and the threaded hole, further, the connection hole 15 may be plural, and the plural connection holes 15 may be provided at opposite sides of the outer case 1, or may be uniformly spaced along the outer edge of the outer case 1, so as to improve the fixing strength and the fixing effect of the first and second cases 11 and 13.
In some specific examples of the present invention, the second housing 13 is further provided with a first through hole communicated with the first air hole 12 and a second through hole communicated with the second air hole 14, the first pressure module 21 is disposed at the first through hole and faces the first air hole 12, the second pressure module 22 is disposed at the second through hole and faces the second air hole 14, such that the first pressure module 21 can be mounted on the second housing 13 through the first through hole, the second pressure module 22 can be mounted on the second housing 13 through the second through hole, the first air hole 12 is communicated with the first through hole, the second air hole 14 is communicated with the second through hole, such that the first pressure module 21 can sense the pressure of the first air hole 12 at the first through hole, and the second pressure module 22 can sense the pressure of the second air hole 14 at the second through hole, so as to obtain the first pressure signal and the second pressure signal. In the example shown in fig. 1, the first through hole and the second through hole are both provided at the upper end of the second housing 13, the first air hole 12 and the second air hole 14 are respectively provided at the lower end of the second housing 13, the first air hole 12 and the first through hole are provided in correspondence in the up-down direction, and the second air hole 14 and the second through hole are provided in correspondence in the up-down direction.
Optionally, the signal processing chip is fixed on the side of the second housing 13 facing the first housing 11, so that the signal processing chip can be protected on the one hand, so that the signal processing chip can be in a closed environment and is prevented from being interfered by the external environment, and on the other hand, the assembly of the signal processing chip and the connection with the first pressure module 21 and the second pressure module 22 are also facilitated.
Further, the differential pressure sensor 100 may further include a pressing plate 4, the substrate 31 is disposed on the pressing plate 4, and the pressing plate 4 is located in the accommodating cavity 16 and is fixedly connected to the second housing 13, so that the pressing plate 4 may be used to fixedly connect the substrate 31 to the second housing 13, which not only facilitates fixing the substrate 31, but also prevents the substrate 31 from being damaged during the connection process by fixing the pressing plate 4 to the substrate 31 and then connecting the pressing plate to the second housing 13. Alternatively, the pressing plate 4 may be connected to the base plate 31 by glue, for example, the pressing plate 4 and the base plate 31 may be adhered by silicone and then fixed to the second housing 13.
The material of clamp plate 4 can adopt metal or plastics to form, and the fixed mode of clamp plate 4 and second casing 13 can be for glue bonds, also can be fixed for example can with clamp plate 4 and second casing 13 welding or through screw connection through the mode, and to this the utility model discloses can not do the restriction as long as can be fixed with clamp plate 4 and second casing 13 can.
In some examples of the present invention, the differential pressure sensor 100 further includes a first sealing element 23 and a second sealing element 24, the first sealing element 23 is disposed between the first pressure module 21 and the second housing 13, the second sealing element 24 is disposed between the second pressure module 22 and the second housing 13, and thus the accommodating cavity 16 between the first housing 11 and the second housing 13 can be sealed by the first sealing element 23 and the second sealing element 24, so that the signal processing chip and a part of the first pressure module 21 and the second pressure module 22 are in a sealed environment, so as to avoid the interference of the external environment and the measured medium on the signal processing chip and the first pressure module 21 and the second pressure module 22, and further stabilize the output signal of the differential pressure sensor 100.
As shown in fig. 1, the first sealing member 23 and the second sealing member 24 may be both formed as sealing rings, a first step portion 36 is formed in the first through hole, a second step portion 37 is formed in the second through hole, the first step portion 36 may be used for supporting the first pressure module 21, the second step portion 37 may be used for supporting the second pressure module 22, the first sealing member 23 is compressed between the first pressure module 21 and the first step portion 36, and the second sealing member 24 is compressed between the second pressure module 22 and the second step portion 37. Therefore, the gap between the first pressure module 21 and the second housing 13 can be sealed by the first sealing member 23, the gap between the second pressure module 22 and the second housing 13 can be sealed by the second sealing member 24, so that the accommodating cavity 16 between the first housing 11 and the second housing 13 can form a sealed space, the first pressure module 21 and the second pressure module 22 can be tightly connected with the second housing 13, and the first sealing member 23 and the second sealing member 24 can play a certain buffering role to reduce the rigid damage between the first pressure module 21 and the second pressure module 22 and the second housing 13.
In some embodiments of the present invention, the signal processing chip may include a substrate 31 and a flexible circuit board (i.e. a first flexible circuit board 32 and a second flexible circuit board 33 as shown in fig. 1) for transmitting voltage signals, the flexible circuit board is electrically connected to the first pressure module 21 and the second pressure module 22 respectively, as shown in fig. 1, the flexible circuit board may include a first flexible circuit board 32 and a second flexible circuit board 33, the first flexible circuit board 32 connects the substrate 31 and the first pressure module 21, the second flexible circuit board 33 connects the substrate 31 and the second pressure module 22, the flexible circuit board can realize the electrical connection between the first pressure module 21 and the second pressure module 22 and the substrate 31, since the flexible circuit board has a certain flexibility, the flexible circuit board can be deformed, thereby facilitating the connection between the substrate 31 and the first pressure module 21 as well as the second pressure module 22, wherein the first flexible circuit board 32 and the second flexible circuit board 33 can also realize the electrical connection via a pin or a wire bonding And (4) interconnecting the electric appliances.
As shown in fig. 1, a first mounting hole 34 corresponding to the first pressure module 21 and a second mounting hole 35 corresponding to the second pressure module 22 are formed in the substrate 31, the flexible circuit board passes through the first mounting hole 34 and the first pressure module 21 and passes through the second mounting hole 35 to be connected to the second press module, specifically, the substrate 31 is disposed on the upper surface of the second housing 13, the first mounting hole 34 and the second mounting hole 35 are formed in the substrate 31, the first mounting hole 34 corresponds to the first pressure module 21, the second mounting hole 35 corresponds to the second pressure module 22, so that the first flexible circuit can pass through the first mounting hole 34 to be connected to the first pressure module 21, and the second flexible circuit board 33 can pass through the second mounting hole 35 to be connected to the second pressure module 22.
In some examples, the external component 5 is formed as a socket, the pin 51 of the socket is connected to the signal processing chip, the socket 52 of the external component 5 faces the side portion of the housing 1, as shown in fig. 1, one end of the external component 5 is connected to the housing 1, the other end of the external component 5 is bent toward the side portion of the housing 1 so that the socket 52 of the external component 5 faces the side portion of the housing 1, since the external component 5 is formed with a bent portion, thereby preventing foreign matter from falling into the external component 5 to cause blockage so that the differential pressure sensor 100 cannot be used, the pin 51 is provided in the external component 5, one end of the pin 51 is connected to the substrate 31 for leading out the differential pressure signal acquired by the substrate 31, and specifically, the external component 5 may communicate with an external wire harness so as to transmit the differential pressure signal.
The utility model also provides an exhaust gas recirculation system.
According to the utility model discloses exhaust gas recirculation system can include differential pressure sensor 100 and venturi, and differential pressure sensor 100's first gas pocket 12 and second gas pocket 14 communicate with venturi's both ends respectively.
Therefore according to the utility model discloses exhaust gas recirculation system can detect the pressure at venturi both ends respectively through differential pressure sensor 100 of above-mentioned embodiment to can carry out data acquisition and calculate in order to obtain differential pressure information, thereby can calculate venturi's exhaust quality and flow, moreover differential pressure sensor 100 can be used for detecting high temperature, contain the measured medium of smoke and dust and corrosive gas, thereby can be used for detecting engine exhaust's exhaust gas, realizes the calculation and the measurement of exhaust flow to exhaust gas recirculation system's rate of circulation, and improves life.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (12)
1. A differential pressure sensor, comprising:
a housing having a receiving chamber and first and second air holes communicating with the outside;
the first pressure module and the second pressure module are arranged in the containing cavity, the first pressure module faces the first air hole to obtain a first pressure signal, and the second pressure module faces the second air hole to obtain a second pressure signal;
the signal processing chip is arranged in the accommodating cavity and is electrically connected with the first pressure module and the second pressure module respectively so as to receive and process the first pressure signal and the second pressure signal to obtain a differential pressure signal;
and the external part is arranged on the shell and connected with the signal processing chip so as to lead out the pressure difference signal of the signal processing chip.
2. The differential pressure sensor according to claim 1, wherein the outer shell includes a first shell and a second shell, a bottom of the first shell being open to define the receiving chamber in cooperation with the second shell, the first air hole and the second air hole being formed in the second shell.
3. The differential pressure sensor according to claim 2, wherein the second housing is provided with a first through hole communicating with the first air hole and a second through hole communicating with the second air hole, the first pressure block is provided at the first through hole and faces the first air hole, and the second pressure block is provided at the second through hole and faces the second air hole.
4. The differential pressure sensor of claim 3, further comprising a first seal disposed between the first pressure module and the second housing and a second seal disposed between the second pressure module and the second housing.
5. The differential pressure sensor according to claim 4, wherein the first seal and the second seal are each formed as a seal ring, a first step is formed in the first through hole, a second step is formed in the second through hole, the first seal is compressed between the first pressure die set and the first step, and the second seal is compressed between the second pressure die set and the second step.
6. The differential pressure sensor according to claim 2, wherein the signal processing chip is fixed to a side of the second housing facing the first housing.
7. The differential pressure sensor of claim 1, wherein the signal processing chip comprises a substrate and a flexible circuit board for transmitting voltage signals, the flexible circuit board being electrically connected with the first pressure module and the second pressure module, respectively.
8. The differential pressure sensor of claim 7, further comprising a pressure plate, wherein the base plate is disposed on the pressure plate, and wherein the pressure plate is positioned within the receiving cavity and is fixedly coupled to the housing.
9. The differential pressure sensor of claim 7, wherein the substrate defines a first mounting hole corresponding to the first pressure module and a second mounting hole corresponding to the second pressure module, and the flexible circuit board is coupled to the first pressure module through the first mounting hole and coupled to the second pressure module through the second mounting hole.
10. The differential pressure sensor according to claim 1, wherein the externally-connected member is formed as a socket, pins of the socket are connected to the signal processing chip, and a socket of the externally-connected member faces a side of the housing.
11. The differential pressure sensor of claim 2, wherein the outer shell is provided with a connecting hole through the first and second housings, a fastener passing through the connecting hole to fixedly connect the first and second housings.
12. An exhaust gas recirculation system, comprising:
the differential pressure sensor of any of claims 1-11;
the first air hole and the second air hole of the differential pressure sensor are communicated with two ends of the Venturi tube respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220105709.8U CN217107252U (en) | 2022-01-14 | 2022-01-14 | Differential pressure sensor and exhaust gas recirculation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220105709.8U CN217107252U (en) | 2022-01-14 | 2022-01-14 | Differential pressure sensor and exhaust gas recirculation system |
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| Publication Number | Publication Date |
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| CN217107252U true CN217107252U (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220105709.8U Active CN217107252U (en) | 2022-01-14 | 2022-01-14 | Differential pressure sensor and exhaust gas recirculation system |
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| Country | Link |
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| CN (1) | CN217107252U (en) |
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- 2022-01-14 CN CN202220105709.8U patent/CN217107252U/en active Active
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